# Circular railway

The railway connects in a circular arc the points A, B, and C, whose distances are | AB | = 30 km, AC = 95 km, BC | = 70 km. How long will the track be from A to C?

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**algebra**- expression of a variable from the formula
**planimetrics**- circle
- area of a shape
- perimeter
- triangle
- The Law of Cosines
- Heron's formula
**basic functions**- reason
**goniometry and trigonometry**- arccosine

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